The first-order irreversible exothermic liquid-phase reaction
A→ B
is to be carried out in a jacketed CSTR. Species A and an inert I are fed to the reactor in equimolar amounts. The molar feed rate of A is 80 mol/min.
(a) What is the reactor temperature for a feed temperature of 450 K?
(b) Plot the reactor temperature as a function of the feed temperature.
(c) To what inlet temperature must the fluid be preheated for the reactor to operate at a high conversion? What are the corresponding temperature and conversion of the fluid in the CSTR at this inlet temperature?
(d) Suppose that the fluid is now heated 5 °C above the temperature in part (c) and then cooled 20 °C, where it remains. What will be the conversion?
(e) What is the inlet extinction temperature for this reaction system?
Additional information:
Heat capacity of the inert: 30 cal/g mol -°C τ = 100 inin
Heat capacity of A and B: 20 cal/g mol -°C ΔH°Rx = −7500 cal/mol
UA \ 8000 cal/min-°C k = 6.6 X 10−3 min−1‘at 350 K
Ambient temperature, Ta: 300 K E = 40,000 cal/mol • K
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